Superintendent Carolan added: "Garda resources are not being spared in this investigation and several hundred lines of enquiry are being examined.

"We have received massive assistance from the public as well as very valuable information from the local community, the Polish community and the homeless community. However, we are still appealing for anyone with information to come forward.”

Gardaí are appealing to anyone who knew Michal, in particular anyone who met him or knew of his movements at any time on Thursday 3rd August or Friday 4th August to contact with Balbriggan Garda Station on 01 802 0510 or the Garda Confidential Line 1800 666 111.